字符串操作

#include<iostream>
#include<cstring>

using namespace std;

int main()
{
    string str;
    cin>>str;
    for(int i = 0;i < str.size();i += 1)
        if(isalpha(str[i]))
            if(isdigit(str[i+1]) && i+1 < str.size())
                for(int j = 0;j < str[i+1]-'0';j ++)
                    printf("%c",str[i]);
            else
                printf("%c",str[i]);


    return 0;
}